Sil

If nothing else, Natasha Henstridge’s Sil qualifies as the worst one-night stand in the history of cinema. In Species, the supermodel-turned-actress plays a half-human/half-alien who looks like Henstridge when seducing male prey, but quickly turns into a disgusting slimy monster (designed by Alien artist H.R. Giger) just when things start to get amorous. In other words, the creepy/sleazy ‘90s basic cable classic is enough to make you wary of any gal who looks like Henstridge who tries to seduce you in a bar. (Well… almost.)